Date:         Tue, 18 Jan 2005 14:50:39 -0600
Reply-To:     Jim Felder <felder@KNOLOGY.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Jim Felder <felder@KNOLOGY.NET>
Subject:      Re: Head treatment for pitting--flattening technique
In-Reply-To:  <003d01c4fd91$e06ecea0$72e05e44@noner4688xfd1h>
Content-Type: text/plain; charset=US-ASCII; format=flowed

In my case, I didn't want to spend money on the heads but didn't want
them to leak either. The car ran great, no drip, no smoke, no oil
consumption. I drive the car very little these days, am usually in the
diesel. It's going to get a new or rebuilt engine sometime soon anyway,
I'd rather put the money toward that.

But since the JB weld outlasts the aluminum on the head, what's
half-fast about using it? If my head surfaces had been coated with jb
weld from the factory, I would have probably saved the two gasket jobs
the car has had in its life.

And aren't you changing the compression by flycutting both sealing
surfaces, just to get the proper sealing dimension at the water
surface?

Jim

On Jan 18, 2005, at 1:14 PM, Stan Wilder wrote:

> Why wouldn't you want to just weld up the pits and have the head
> flycut for
> proper sealing surface at the barrels.
> That JB patch is just half fast way to be doing the job a second time.
> An then there is the potential that you heads have reached EOL and
> should be
> replaced.
>
> Stan Wilder
> Engine Ceramics
> 214-352-4931
> www.engineceramics.com
> ----- Original Message -----
> From: "Daryl Christensen" <aatransaxle@DIRECWAY.COM>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Tuesday, January 18, 2005 11:34 AM
> Subject: Re: Head treatment for pitting--flattening technique
>
>
>> The shop I was at for years used the JB trick on many since the mid
>> 90's
> on
>> vans whoose owners were fiscally challenged...Works slick for long
>> periods
>> of time....One I know of ran another 75K before we lost track of
>> it...JB
>> wont pit or corrode. Daryl
>> ----- Original Message -----
>> From: "Robert Fisher" <refisher@MCHSI.COM>
>> To: <vanagon@GERRY.VANAGON.COM>
>> Sent: Monday, January 17, 2005 12:15 PM
>> Subject: Re: Head treatment for pitting--flattening technique
>>
>>
>>> I wound up doing the JB thing to my pitted heads after the machine
>>> shop
> had
>>> taken them apart and thoroughly cleaned them; I sanded them down as
>>> best
> I
>>> could with a block, mainly looking for bubbles (holes), etc.
>>> Everything
>>> looked pretty good, but I knew I didn't have it perfectly flush, so
>>> when
> I
>>> took the heads back to the shop to have them finished, they shaved
>>> the
>>> mating surfaces slightly to get them flat. Now they understood about
>>> the
>>> cylinder clearances and all that, so they just took off some very
>>> slight
>>> fraction of an inch (don't remember exactly, might have been
>>> 1/100ths).
>>> They
>>> figured that the gaskets and such probably had more give than what
>>> they
>>> took
>>> off. Didn't seem to have any effect at all on reassembly or running;
> that
>>> was probably 12,000 miles ago or more and all is well so far,
>>> assuming I
>>> didn't just jinx myself.
>>>
>>> Probably something you wouldn't be able to get away with more than
>>> once
>>> but
>>> it seemed to be effective.
>>>
>>> Cya,
>>> Robert
>>>
>>> ----- Original Message -----
>>> From: "Jim Felder" <felder@KNOLOGY.NET>
>>> To: <vanagon@GERRY.VANAGON.COM>
>>> Sent: Monday, January 17, 2005 7:50 AM
>>> Subject: Head treatment for pitting--flattening technique
>>>
>>>
>>>> I'm slogging through head replacement and have tried a technique
>>>> that,
>>>> while I can't say it's worked out well because I haven't run the
>>>> car,
>>>> seems worthy of mention for others contemplating the same procedure.
>>>>
>>>> I had the heads cleaned, then dremeled out the corrosion to leave
>>>> bright, shiny pits and filled them with JB weld. Cured overnight.
>>>> Then
>>>> I spray-glued 100 grit sandpaper to 3/4 inch smooth plywood, mounted
>>>> the sanding surface on a table, and sanded the head in a circular
>>>> motion until all was perfectly--and I do mean perfectly--flat.
>>>>
>>>> I have pictures of procedure and results if anyone is interested.
>>>> Everyone may do this, I don't know. But it saved me a couple of
>>>> trips
>>>> to the machine shop and went really quickly. I tried it wet and dry,
>>>> both have advantages/disadvantages. I'd just do dry next time.
>>>>
>>>> Jim
>>>
>>
>>
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>
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